The philosophy of mind covers all philosophical topics pertaining to the mind and mental states. Its subtopics can be divided in two main ways. First, by the traditional divisions drawn between kinds of mental states: consciousness, intentionality, perception, and other states and processes. Second, by the types of philosophical questions asked about these activities: especially metaphysical questions that have to do with their nature (especially the relation between the mental and the physical) and epistemological questions that have to do with our knowledge of them. The philosophy of mind also overlaps with the philosophy of cognitive science and the philosophy of action.